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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Tax Disclosure [Abstract]        
Federal statutory income tax expense 21.00% 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 2.90% 4.80% 2.90% 4.90%
Permanent differences 0.40% (0.10%) 0.40% (3.70%)
Change in valuation allowance 0.00% 0.00% 0.00% (3.80%)
Tax credits (3.20%) (1.20%) (2.80%) (1.80%)
Other 0.10% 0.00% 0.50% 0.00%
Total income tax expense 21.30% 24.40% 22.10% 16.60%